package com.artup.util.md5;

import java.security.MessageDigest;

public class MD5 {

   private MD5() {}
   
   public final static String getMessageDigest(byte[] buffer) {
      char hexDigits[] = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
      try {
         MessageDigest mdTemp = MessageDigest.getInstance("MD5");
         mdTemp.update(buffer);
         byte[] md = mdTemp.digest();
         int j = md.length;
         char str[] = new char[j * 2];
         int k = 0;
         for (int i = 0; i < j; i++) {
            byte byte0 = md[i];
            str[k++] = hexDigits[byte0 >>> 4 & 0xf];
            str[k++] = hexDigits[byte0 & 0xf];
         }
         return new String(str);
      } catch (Exception e) {
         return null;
      }
   }
}